CSEC Chemistry Paper 1 May/June 2011 - Free CXC Past Paper with Answers

Which of the following particles represents an anion?

Which of the following pairs are isotopes?

Which of the following ions requires the LARGEST number of moles of electrons to liberate one mole of it?

In which group of the periodic table should Element Z be placed?

The oxidation state of an ion of Element Z would MOST probably be

Which of the following mixtures can be referred to as a standard solution?

When solid lead nitrate is heated, it decomposes giving off nitrogen (IV) oxide and oxygen. The balanced equation for this reaction is

Which of the following compounds has the GREATEST percentage by mass of carbon present in one mole? (Mᵣ = relative molecular mass; relative atomic mass: H = 1; C = 12; O = 16)

A metallic bond is formed when

An example of a substance with a macromolecular structure is

Which of the following is the CORRECT formula for ammonium carbonate?

Graphite is used as an electrode because it

Which of the following statements about covalent compounds are TRUE? I. They are mainly solids. II. They usually have low melting and boiling points. III. They are usually insoluble in water. IV. They contain only ions.

A piece of calcium was added to some distilled water in a container. The gas produced would be expected to

A separating funnel can be used to separate a mixture of

One way in which hydrogen resembles the Group 7 elements is that hydrogen

The pH of fresh sugar cane juice which is usually in the range 5.0 - 5.5 can be changed to 7.5 - 8.0 for more efficient processing by adding

Sulphuric acid is a stronger acid than ethanoic acid (acetic acid) in aqueous solution because sulphuric acid

Which of the following is NOT a normal salt?

The ionic equation for the reaction between an acid and a carbonate may be represented as

Which of the compounds is reduced?

Which of the compounds is the oxidising agent?

Acidified potassium manganate (VII) is usually used as

Which of the following occurs to a metal atom when it becomes an ion?

In which of the following does hydrogen have a negative oxidation number?

If solutions containing one mole of solute per dm³ of aqueous solution are investigated, which solution should cause the bulb to glow BRIGHTEST?

Which of the following will NOT conduct electricity?

A current of 5 amperes was passed for 193 seconds through a solution of copper (II) sulphate using copper electrodes. The mass of copper that would be gained at the

Which of the following elements does NOT react with H+ (aq) ions to give hydrogen gas?

Which of the following statements BEST characterises a catalyst?

Which of the following statements would be TRUE of exothermic reactions?

I. Heat energy is absorbed from the surroundings. II. Heat energy is given out to the surroundings. III. The products possess less energy than the reactants.

The reaction occurring at the cathode during the electrolysis of copper sulphate using inert electrodes is given by the equation

Which of the following substances conducts an electric current but remains chemically unchanged?

The compound is MOST likely to be

The concentrated hydrochloric acid is acting as

The gas given off is

A recently discovered element is thought to be a metal. Which of the following physical properties would BEST confirm this?

Which compound is one of the MAIN substances responsible for the formation of acid rain?

may be used to counteract the effects of acid rain on the soil?

Which of these reactions would be responsible for returning carbon dioxide to the atmosphere?

Over time, aluminium articles do not deteriorate in air as do iron articles. Which of the following statements gives the CORRECT reason?

Which of the following elements is MOST electropositive?

Ammonia may be produced in the laboratory by heating a mixture of ammonium chloride and

Which of the following substances is the catalyst used in the manufacture of sulphuric acid by the contact process?

The compound ethene is described as being unsaturated. This means that the

Which of the following would be characteristic of a homologous series?

I. All members possess the same general molecular formula. II. Each member differs from the next by a common group. III. All members have similar chemical properties. IV. The physical properties of members change gradually as the relative molecular mass changes.

Which of the following pairs of structural formulae are isomers of C₄H₁₀?

Ethyl ethanoate and fats are classified as esters. From this information it can be deduced that they BOTH

undergoes addition reactions?

is immiscible with water and is sweet smelling?

is dehydrated by concentrated sulphuric acid to produce a gas which decolourises bromine?

Which of the following is used in the breathalyser test to detect the presence of alcohol?

Which of the following processes CORRECTLY describes the reaction above?

The MAJOR natural source of alkanes and alkenes is

The process by which large molecules of hydrocarbons are broken up into smaller molecules is called

The reaction of fats with concentrated aqueous sodium hydroxide is commonly referred to as

Which of the following linkages is found in an amide?

Which of the following types of polymer may be derived from compounds like the one below?